<?php
header('Content-Type: application/json');

// Validate input ---------------------------------------------
if (!isset($_GET['id']) || empty($_GET['id'])) {
    echo json_encode(["error" => "id parameter missing"]);
    exit;
}

$receiptNo = $_GET['id'];
$url = "https://transactioninfo.ethiotelecom.et/receipt/" . $receiptNo;

// Load Telebirr HTML -----------------------------------------
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

$html = curl_exec($ch);
curl_close($ch);

if (!$html) {
    echo json_encode(["error" => "Unable to load Telebirr page"]);
    exit;
}

// Parse HTML ---------------------------------------------------
libxml_use_internal_errors(true);
$doc = new DOMDocument();
$doc->loadHTML($html);
$xpath = new DOMXPath($doc);

// Telebirr table cells
$tds = $xpath->query("//td");

// Field map (Amharic + English)
$map = [
    "የክፍያው ሁኔታ" => "transaction_status",
    "transaction status" => "transaction_status",

    "የከፋይ ስም" => "payer_name",
    "payer name" => "payer_name",

    "የከፋይ ቴሌብር ቁ" => "payer_phone",
    "payer telebirr no" => "payer_phone",

    "የከፋይ አካውንት አይነት" => "payer_account_type",
    "payer account type" => "payer_account_type",

    "የገንዘብ ተቀባይ ስም" => "credited_party_name",
    "credited party name" => "credited_party_name",

    "የገንዘብ ተቀባይ ቴሌብር ቁ" => "credited_party_account",
    "credited party account no" => "credited_party_account",

    "የተከፈለው መጠን" => "settled_amount",
    "settled amount" => "settled_amount",

    "ጠቅላላ የተከፈለ" => "total_amount",
    "total amount paid" => "total_amount",

    "15% ቫት" => "vat_amount",
    "vat" => "vat_amount",

    "ቅናሽ" => "discount_amount",
    "discount amount" => "discount_amount",

    "የገንዘቡ በፊደል" => "amount_in_word",
    "total amount in word" => "amount_in_word",

    "የክፍያ መንገድ" => "payment_channel",
    "payment channel" => "payment_channel",

    "የክፍያ ዘዴ" => "payment_mode",
    "payment mode" => "payment_mode",

    "የክፍያ ምክንያት" => "payment_reason",
    "payment reason" => "payment_reason",

    "የክፍያ ቀን" => "payment_date",
    "payment date" => "payment_date"
];

// Date detection regex
$dateRegex = '/(\d{4}[-\/]\d{2}[-\/]\d{2}|\d{2}\/\d{2}\/\d{4}|[A-Za-z]+\s+\d{1,2},\s*\d{4})/';

$response = [];

// Extract fields from Telebirr table --------------------------
for ($i = 0; $i < $tds->length; $i++) {

    $key = strtolower(trim(preg_replace('/\s+/', ' ', $tds->item($i)->nodeValue)));
    $value = trim($tds->item($i + 1)->nodeValue);

    foreach ($map as $search => $field) {

        if (strpos($key, strtolower($search)) !== false) {

            // Special case: extract payment date only if real date exists
            if ($field === "payment_date") {
                if (preg_match($dateRegex, $value, $matches)) {
                    $response["payment_date"] = $matches[0];
                }
                continue;
            }

            // Clean numeric values
            if (in_array($field, ["settled_amount", "total_amount", "vat_amount", "discount_amount"])) {
                $value = floatval(str_replace(['Birr', ',', ' '], '', $value));
            }

            $response[$field] = $value;
        }
    }
}

// Extract payment date from page header (fallback) -------------
if (!isset($response["payment_date"])) {
    $headers = $xpath->query("//h1|//h2|//h3|//h4|//h5|//p");

    foreach ($headers as $node) {
        $text = trim($node->nodeValue);

        if (preg_match($dateRegex, $text, $m)) {
            $response["payment_date"] = $m[0];
            break;
        }
    }
}

// Add receipt number always
$response["receipt_no"] = $receiptNo;

// Validate & output ------------------------------------------------
if (count($response) <= 1) {
    echo json_encode(["error" => "Receipt not found or invalid"]);
    exit;
}

echo json_encode($response, JSON_PRETTY_PRINT);
?>